package com.atguigu.gulimail.product.service.impl;

import com.atguigu.common.utils.R;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimail.product.dao.CategoryDao;
import com.atguigu.gulimail.product.entity.CategoryEntity;
import com.atguigu.gulimail.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> queryListTree() {
        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);
        List<CategoryEntity> entityTree = categoryEntities.stream().filter(c -> c.getParentCid() == 0)
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity, categoryEntities));
                    return categoryEntity;
                }).sorted((mnus1, mnus2) -> {
                    return (mnus1.getSort() == null ? 0 : mnus1.getSort()) - (mnus2.getSort() == null ? 0 : mnus2.getSort());
                })

                .collect(Collectors.toList());


        return entityTree;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        baseMapper.deleteBatchIds(asList);
    }

    private List<CategoryEntity> getChildren(CategoryEntity categoryEntity, List<CategoryEntity> categoryEntities) {

        List<CategoryEntity> childrenList = categoryEntities.stream()
                .filter(e ->{return e.getParentCid() .equals(categoryEntity.getCatId()) ;})
                .map((e) -> {
                    e.setChildren(getChildren(e, categoryEntities));
                    return e;
                }).sorted((e1, e2) -> {
                    return (e1.getSort() == null ? 0 : e1.getSort()) - (e2.getSort() == null ? 0 : e2.getSort());
                }).collect(Collectors.toList());

        return childrenList;

    }
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1、找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //2、菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }


}